/Engine/Source/Runtime/Engine/Classes/Kismet/KismetSystemLibrary.h
Prints text to the log, and optionally, to the screen If Print To Log is true, it will be visible in the Output Log window. Otherwise it will be logged only as 'Verbose', so it generally won't show up.
static void PrintText ( const [UObject](API\Runtime\CoreUObject\UObject\UObject) * WorldContextObject, const [FText](API\Runtime\Core\Internationalization\FText) InText, bool bPrintToScreen, bool bPrintToLog, [FLinearColor](API\Runtime\Core\Math\FLinearColor) TextColor, float Duration, const [FName](API\Runtime\Core\UObject\FName) Key )